CN103475214A - Switch converter and control circuit and control method thereof - Google Patents
Switch converter and control circuit and control method thereof Download PDFInfo
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- CN103475214A CN103475214A CN2013104018052A CN201310401805A CN103475214A CN 103475214 A CN103475214 A CN 103475214A CN 2013104018052 A CN2013104018052 A CN 2013104018052A CN 201310401805 A CN201310401805 A CN 201310401805A CN 103475214 A CN103475214 A CN 103475214A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/59—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices including plural semiconductor devices as final control devices for a single load
- G05F1/595—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices including plural semiconductor devices as final control devices for a single load semiconductor devices connected in series
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a switching converter, a control circuit and a control method thereof. By introducing the transconductance amplifier and the resistor into the direct current calibration circuit, the current flowing into the capacitor in the direct current calibration circuit is reduced, so that the equivalent capacitance value of the capacitor is amplified, and a user can integrate a capacitor with a smaller capacitance value into the circuit to realize direct current calibration.
Description
Technical field
The present invention relates to electronic circuit, relate in particular to switch converters and control circuit thereof and control method.
Background technology
In the switch transformed circuit (COT switch transformed circuit) that adopts constant on-time to control, for improving load regulation ability and the input voltage regulation ability of circuit, the COT switch transformed circuit generally includes a direct current calibration circuit.
Existing direct current calibration circuit generally includes a trsanscondutance amplifier and a capacitor.This trsanscondutance amplifier receives reference voltage and sampled signal, and produces error current according to reference voltage and sampled signal.Error current flows in capacitor, thereby produces capacitance voltage at the capacitor two ends.This capacitance voltage is the calibration reference voltage of direct current calibration circuit output.For the COT switch transformed circuit that comprises this type of direct current calibration circuit, enter saturation condition when the underloading for preventing the direct current calibration circuit, the appearance value of capacitor must be enough greatly, for example, 22nF.The electric capacity of great Rong value is difficult to be integrated in circuit like this, and therefore, circuit chip usually need to have special pin so that the user can utilize CSET to realize the direct current calibration function.Yet the pin of circuit chip is more, its cost will be higher.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of switch converters and control circuit and control method that can reduce electric capacity in the direct current calibration circuit.
According to a kind of control circuit for switch converters of the embodiment of the present invention, this switch converters comprises switching circuit, and this control circuit comprises direct current calibration circuit, comparison circuit, ON time control circuit and logical circuit.Wherein, this direct current calibration circuit has first input end, the second input and output, this first input end and the second input receive respectively reference voltage and sampled signal, and the direct current calibration circuit produces calibration reference voltage according to reference voltage and sampled signal at its output.This direct current calibration circuit comprises the first amplifier, the second amplifier, the first resistor and capacitor.This first amplifier has first input end, the second input and output, this first input end and the second input receive respectively reference voltage and sampled signal, and the first amplifier amplifies the difference between reference voltage and sampled signal and produces error current at its output.Wherein, sampled signal comprises the feedback signal of output voltage or the expression output voltage of switch converters.This second amplifier has first input end, the second input and output, and this first input end is coupled to the output of the first amplifier to receive error current, and this output is coupled to the output of its first input end and direct current calibration circuit.This first resistor is coupled between the first input end and the second input of the second amplifier.This capacitor is coupled between second input and ground of the second amplifier.This comparison circuit has first input end, the second input and output, this first input end receives sampled signal, this second input is coupled to the output of direct current calibration circuit to receive calibration reference voltage, comparison circuit compares calibration reference voltage and sampled signal, and produces comparison signal at its output.This ON time control circuit produces the ON time control signal.This logical circuit has first input end, the second input and output, this first input end is coupled to the ON time control circuit to receive the ON time control signal, this second input is coupled to comparison circuit to receive comparison signal, and logical circuit produces control signal with the control switch circuit according to ON time control signal and comparison signal at output.
In one embodiment, control circuit also comprises the 3rd amplifier and the second resistor.The 3rd amplifier has first input end, the second input and output, and this first input end is coupled to the output of the second amplifier, and this second input receives bias voltage, and this output is coupled to the output of direct current calibration circuit.This second resistor is coupled between the first input end of the output of the 3rd amplifier and the first amplifier.
According to a kind of switch converters of the embodiment of the present invention, comprise direct current calibration circuit, comparison circuit, ON time control circuit, logical circuit and switching circuit.Wherein, this direct current calibration circuit has first input end, the second input and output, this first input end and the second input receive respectively reference voltage and sampled signal, and the direct current calibration circuit produces calibration reference voltage according to reference voltage and sampled signal at its output.This direct current calibration circuit comprises the first amplifier, the second amplifier, the first resistor and capacitor.This first amplifier has first input end, the second input and output, this first input end and the second input receive respectively reference voltage and sampled signal, and the first amplifier amplifies the difference between reference voltage and sampled signal and produces error current at its output.Wherein, sampled signal comprises the feedback signal of output voltage or the expression output voltage of switch converters.This second amplifier has first input end, the second input and output, and this first input end is coupled to the output of the first amplifier to receive error current, and this output is coupled to the output of its first input end and direct current calibration circuit.This first resistor is coupled between the first input end and the second input of the second amplifier.This capacitor is coupled between second input and ground of the second amplifier.This comparison circuit has first input end, the second input and output, this first input end receives sampled signal, this second input is coupled to the output of direct current calibration circuit to receive calibration reference voltage, comparison circuit compares calibration reference voltage and sampled signal, and produces comparison signal at its output.This ON time control circuit produces the ON time control signal.This logical circuit has first input end, the second input and output, this first input end is coupled to the ON time control circuit to receive the ON time control signal, this second input is coupled to comparison circuit to receive comparison signal, and logical circuit produces control signal with the control switch circuit according to ON time control signal and comparison signal at output.This switching circuit receives input voltage and is coupled to logical circuit with reception control signal, and according to control signal, input voltage is converted to output voltage.
A kind of control method for switch converters according to the embodiment of the present invention, this switch converters comprises switching circuit, the method comprises reception reference voltage and sampled signal, and produce error current according to reference voltage and sampled signal, wherein, sampled signal comprises the feedback signal of output voltage or the expression output voltage of switch converters; Error current is shunted, made the part in error current flow into capacitor to produce capacitance voltage; Capacitance voltage and sampled signal are compared and produce comparison signal; The conducting duration of ON time control signal with switching tube in the control switch circuit is provided; And produce control signal based on ON time control signal and comparison signal, with the switching tube in the control switch circuit.
According to embodiments of the invention, by introduce trsanscondutance amplifier and resistor in the direct current calibration circuit, the equivalent capacitance value of the electric capacity in the direct current calibration circuit is amplified, the user can integratedly in circuit calibrate to realize direct current than the electric capacity of low-capacitance, and guarantees that this direct current calibration circuit can not enter saturation condition.
The accompanying drawing explanation
Fig. 1 illustrates the COT switch transformed circuit principle Figure 100 according to one embodiment of the invention.
Fig. 2 illustrate the small-signal model equivalent electric circuit 106 of direct current calibration circuit 106 in Fig. 1 '.
Fig. 3 illustrates the direct current calibration circuit 206 according to another embodiment of the present invention.
Fig. 4 illustrate the small-signal model equivalent electric circuit 206 of direct current calibration circuit 206 in Fig. 3 '.
Fig. 5 illustrates the control method 500 according to the control COT switch transformed circuit of one embodiment of the invention.
Embodiment
Below will describe specific embodiments of the invention in detail, it should be noted that the embodiments described herein, only for illustrating, is not limited to the present invention.In the following description, in order to provide thorough understanding of the present invention, a large amount of specific detail have been set forth.Yet, for those of ordinary skills, it is evident that: needn't adopt these specific detail to carry out the present invention.In other examples, for fear of obscuring the present invention, do not specifically describe known circuit, material or method.
In whole specification, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: special characteristic, structure or characteristic in conjunction with this embodiment or example description are comprised at least one embodiment of the present invention.Therefore, phrase " in one embodiment ", " in an embodiment ", " example " or " example " occurred in each place of whole specification differs to establish a capital and refers to same embodiment or example.In addition, can with any suitable combination and or sub-portfolio by specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that the accompanying drawing provided at this is all for illustrative purposes, and accompanying drawing is not necessarily drawn in proportion.Should be appreciated that it can be directly connected or coupled to another element or can have intermediary element when claiming " element " " to be connected to " or " coupling " during to another element.On the contrary, when claiming element " to be directly connected to " or during " being directly coupled to " another element, not having intermediary element.Identical Reference numeral is indicated identical element.Term used herein " and/or " comprise any and all combinations of one or more relevant projects of listing.
Fig. 1 illustrates the COT switch transformed circuit principle Figure 100 according to one embodiment of the invention.As shown in Figure 1, COT switch transformed circuit 100 comprises control circuit, switching circuit 104 and feedback circuit 105.Switching circuit 104 adopts the synchronous buck transformation topology, comprises switching tube M1 and M2, inductor L and output capacitor C.
Switching circuit 104, by conducting and the shutoff of switching tube M1 and M2, is converted to output voltage VO UT by input voltage VIN.Switching tube M1 has first end, the second end and control end, and wherein first end receives input voltage VIN.Switching tube M2 has first end, the second end and control end, its second end ground connection, and its first end is coupled to the second end of switching tube M1.Inductor L has first end and the second end, and wherein first end is coupled to the second end of switching tube M1 and the first end of switching tube M2.Output capacitor C is coupled between the second end and ground of inductor L.The voltage at output capacitor C two ends is output voltage VO UT.
In one embodiment, the switching tube M1 in switching circuit 104 and M2 can be any controllable semiconductor switch device, such as mos field effect transistor (MOSFET), igbt (IGBT) etc.In another embodiment, switching tube M2 can be replaced by diode.In yet another embodiment, switching circuit 104 can adopt any DC-DC or ac/dc transformation topology structure, for example synchronous or asynchronous booster converter, and normal shock, anti exciting converter etc.
Control circuit comprises ON time control circuit 101, comparison circuit 102, logical circuit 103 and direct current calibration circuit 106.Direct current calibration circuit 106 has first input end 106A, the second input 106B and output 106C.Direct current calibration circuit 106 comprises trsanscondutance amplifier GM1, capacitor C1, trsanscondutance amplifier GM2 and resistor R1.Trsanscondutance amplifier GM1 has in-phase input end, inverting input and output, its in-phase input end receives reference voltage VREF as the first input end 106A of direct current calibration circuit 106, its inverting input is coupled to feedback circuit 105 with receiving feedback signals VFB as the second input 106B of direct current calibration circuit 106, trsanscondutance amplifier GM1 amplifies the difference between reference voltage VREF and feedback signal VFB, and produces error current 11 on output.Trsanscondutance amplifier GM2 has in-phase input end, inverting input and output, its inverting input is coupled to the output of trsanscondutance amplifier GM1 to receive error current 11, and its output is coupled to its inverting input and is coupled to the output 106C of direct current calibration circuit 106.Resistor R1 is coupled between the in-phase input end and inverting input of trsanscondutance amplifier GM2.The end of capacitor C1 is coupled to the in-phase input end of trsanscondutance amplifier GM2, and the other end of capacitor C1 is connected to ground.In the embodiment shown in fig. 1, the output voltage VO 2 of trsanscondutance amplifier GM2 is the calibration reference voltage VREF ' of direct current calibration circuit 106 outputs.
ON time control unit 101 produces ON time control signal CO, with the conducting duration of control switch pipe M1.In one embodiment, the conducting duration of switching tube M1 is set to steady state value, or the variable value relevant with input voltage VIN and/or output voltage VO UT.
In one embodiment, control circuit can also comprise the minimum turn-off time control circuit.Minimum turn-off time control circuit output minimum turn-off time signal, to logical circuit 103, has the minimum turn-off time to guarantee the switching tube M1 in switching circuit 104.
Utilize Small Signal Model Analysis Method, the calibration circuit of direct current shown in Fig. 1 106 can be equivalent to the equivalent electric circuit of small-signal model shown in Fig. 2 106 '.As shown in Figure 2, the trsanscondutance amplifier GM2 in Fig. 1, resistor R1 and capacitor C1 are equivalent to connecting of an equivalent resistance and an equivalent electric capacity.If the transadmittance gain of trsanscondutance amplifier GM2 is G2, the resistance of resistor R1 also means with symbol R1, and the appearance value of capacitor C1 also means with symbol C1, and the resistance of this equivalence resistance is 1/G2, and the appearance value of this equivalence electric capacity is C1 * R1 * G2.
Visible, after adding trsanscondutance amplifier GM2 and resistor R1, the equivalence appearance value of capacitor C1 has been exaggerated R1 * G2 doubly.In one embodiment, R1=500Kohm, G2=0.2ms, C1=30pF, the equivalence appearance value of capacitor C1 has been amplified 100 times, is 3nF.Therefore, utilize the direct current calibration circuit 106 shown in Fig. 1, can adopt the electric capacity that the appearance value is less to carry out the direct current calibration, the electric capacity of low-capacitance is easy to be integrated in circuit chip like this.
Fig. 3 illustrates the direct current calibration circuit 206 according to another embodiment of the present invention.As shown in Figure 3, direct current calibration circuit 206 comprises first input end 206A, the second input 206B and output 206C.With the direct current calibration circuit 106 shown in Fig. 1, compare, direct current calibration circuit 206 also comprises trsanscondutance amplifier GM3 and resistor R2.Wherein, trsanscondutance amplifier GM3 has in-phase input end, inverting input and output.The in-phase input end of trsanscondutance amplifier GM3 is coupled to the output of trsanscondutance amplifier GM2 to receive the output voltage VO 2 of trsanscondutance amplifier GM2, and its inverting input receives bias voltage VBIAS, and its output is coupled to the output 206C of direct current calibration circuit 206.Resistor R2 is coupled between the in-phase input end of the output of trsanscondutance amplifier GM3 and trsanscondutance amplifier GM1.Trsanscondutance amplifier GM3 produces output voltage VO 3 according to output voltage VO 2 and the bias voltage VBIAS of trsanscondutance amplifier GM2 at its output.In the embodiment shown in fig. 3, the output voltage VO 3 of trsanscondutance amplifier GM3 is the calibration reference voltage VREF ' of direct current calibration circuit 206 outputs.
Utilize Small Signal Model Analysis Method, when the value of bias voltage VBIAS is VBlAS=VREF/ (R2 * G3), the calibration circuit of direct current shown in Fig. 3 206 can be equivalent to the equivalent electric circuit of small-signal model shown in Fig. 4 206 '.As shown in Figure 4, trsanscondutance amplifier GM2 and GM3, resistor R1 and R2 and capacitor C1 are equivalent to connecting of an equivalent resistance and an equivalent electric capacity.If the transadmittance gain of trsanscondutance amplifier GM3 is G3, the resistance of resistor R2 also means with symbol R2.The resistance of equivalent resistance shown in Fig. 4 is G3 * R2/G2, and the appearance value of equivalent capacity shown in Fig. 4 is C1 * R1 * G2/ (G3 * R2).
Visible, after adding trsanscondutance amplifier GM3 and resistor R2, the appearance value of capacitor C1 further is enlarged into R1 * G2/ (G3 * R2) doubly.In addition, trsanscondutance amplifier GM3 and resistor R2 can make the output voltage fluctuation of trsanscondutance amplifier GM2 reduce.
In one embodiment, still establish R1=500Kohm, G2=0.2ms, C1=30pF, in addition, establish R2=50ohm, G3=0.2ms, the appearance value of equivalent capacity is 300nF.Visible, in the present embodiment, the equivalence appearance value of capacitor C1 has been exaggerated 10000 times, so the user can integratedly in circuit calibrate to realize direct current than the electric capacity of low-capacitance, and can guarantee that this direct current calibration circuit can not enter saturation condition.
Fig. 5 illustrates the flow chart 500 according to the control method of the control switch translation circuit of one embodiment of the invention.This switch transformed circuit comprises the switching circuit with switching tube.As shown in Figure 5, control method 500 comprises step 501～505.In step 501, receive reference voltage and sampled signal, and produce error current according to this reference voltage and sampled signal.This sampled signal can be the output voltage of switch converters, can be also the feedback signal of representation switch translation circuit output voltage.In step 502, error current is shunted, make the part in error current flow into capacitor to produce capacitance voltage.In step 503, capacitance voltage and sampled signal are compared, and produce comparison signal.In step 504, provide the conducting duration of ON time control signal with switching tube in the control switch circuit.In step 505, produce control signal based on ON time control signal and comparison signal, with the switching tube in the control switch circuit.In another embodiment, in step 503, can comprise that the voltage of capacitance voltage and sampled signal compare by one, thereby produce comparison signal.
Although with reference to several exemplary embodiments, described the present invention, should be appreciated that term used is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from invention because the present invention can specifically implement in a variety of forms, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in the claim of enclosing, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (10)
1. the control circuit for switch converters, switch converters comprises switching circuit, control circuit comprises:
The direct current calibration circuit, there is first input end, the second input and output, described first input end and the second input receive respectively reference voltage and sampled signal, the direct current calibration circuit produces calibration reference voltage according to reference voltage and sampled signal at described output, and the direct current calibration circuit comprises:
The first amplifier, there is first input end, the second input and output, described first input end and the second input receive respectively reference voltage and sampled signal, the first amplifier amplifies the difference between reference voltage and sampled signal and produces error current at described output, wherein, sampled signal comprises the feedback signal of output voltage or the expression output voltage of switch converters;
The second amplifier, have first input end, the second input and output, and described first input end is coupled to the output of the first amplifier to receive error current, and described output is coupled to the output of described first input end and direct current calibration circuit;
The first resistor, be coupled between the first input end and the second input of the second amplifier; And
Capacitor, be coupled between second input and ground of the second amplifier;
Comparison circuit, there is first input end, the second input and output, described first input end receives sampled signal, described the second input is coupled to the output of direct current calibration circuit to receive calibration reference voltage, comparison circuit compares calibration reference voltage and sampled signal, and produces comparison signal at described output;
The ON time control circuit, produce the ON time control signal; And
Logical circuit, there is first input end, the second input and output, described first input end is coupled to the ON time control circuit to receive the ON time control signal, described the second input is coupled to comparison circuit to receive comparison signal, and logical circuit produces control signal with the control switch circuit according to ON time control signal and comparison signal at output.
2. control circuit as claimed in claim 1, the direct current calibration circuit also comprises:
The 3rd amplifier, have first input end, the second input and output, and described first input end is coupled to the output of the second amplifier, and described the second input receives bias voltage, and described output is coupled to the output of direct current calibration circuit; And
The second resistor, be coupled between the first input end of the output of the 3rd amplifier and the first amplifier.
3. control circuit as claimed in claim 2, wherein the first amplifier, the second amplifier and the 3rd amplifier comprise trsanscondutance amplifier.
4. control circuit as claimed in claim 1, wherein comparison circuit comprises comparator, comparator has first input end, the second input and output, wherein, described first input end receives sampled signal, described the second input is coupled to the output of direct current calibration circuit to receive calibration reference voltage, and comparator is by sampled signal and calibration reference voltage compares and export comparison signal at described output.
5. a switch converters comprises:
The direct current calibration circuit, there is first input end, the second input and output, described first input end and the second input receive respectively reference voltage and sampled signal, the direct current calibration circuit produces calibration reference voltage according to reference voltage and sampled signal at described output, and the direct current calibration circuit comprises:
The first amplifier, there is first input end, the second input and output, described first input end and the second input receive respectively reference voltage and sampled signal, the first amplifier amplifies the difference between reference voltage and sampled signal and produces error current at described output, wherein, sampled signal comprises the feedback signal of output voltage or the expression output voltage of switch converters;
The second amplifier, have first input end, the second input and output, and described first input end is coupled to the output of the first amplifier to receive error current, and described output is coupled to the output of described first input end and direct current calibration circuit;
The first resistor, be coupled between the first input end and the second input of the second amplifier; And
Capacitor, be coupled between second input and ground of the second amplifier;
Comparison circuit, there is first input end, the second input and output, described first input end receives sampled signal, described the second input is coupled to the output of direct current calibration circuit to receive calibration reference voltage, comparison circuit compares calibration reference voltage and sampled signal, and produces comparison signal at described output;
The ON time control circuit, produce the ON time control signal;
Logical circuit, there is first input end, the second input and output, described first input end is coupled to the ON time control circuit to receive the ON time control signal, described the second input is coupled to comparison circuit to receive comparison signal, and logical circuit produces control signal with the control switch circuit according to ON time control signal and comparison signal at output; And
Switching circuit, receive input voltage and be coupled to logical circuit with reception control signal, and according to control signal, input voltage being converted to output voltage.
6. switch converters as claimed in claim 5, the direct current calibration circuit also comprises:
The 3rd amplifier, have first input end, the second input and output, and described first input end is coupled to the output of the second amplifier, and described the second input receives bias voltage, and described output is coupled to the output of direct current calibration circuit; And
The second resistor, be coupled between the first input end of the output of the 3rd amplifier and the first amplifier.
7. switch converters as claimed in claim 6, wherein the first amplifier, the second amplifier and the 3rd amplifier comprise trsanscondutance amplifier.
8. switch converters as claimed in claim 5, wherein comparison circuit comprises comparator, comparator has first input end, the second input and output, wherein, described first input end receives sampled signal, described the second input is coupled to the output of direct current calibration circuit to receive calibration reference voltage, and comparator is by sampled signal and calibration reference voltage compares and export comparison signal at described output.
9. switch converters as claimed in claim 5, also comprise feedback circuit, and feedback circuit receives output voltage, and produce feedback signal according to output voltage.
10. the control method of a switch converters, switch converters comprises the switching circuit with switching tube, control method comprises:
Receive reference voltage and sampled signal, and produce error current according to reference voltage and sampled signal, wherein, sampled signal comprises the output voltage of switch converters or means the feedback signal of output voltage;
Error current is shunted, is made the part in error current flow into capacitor to produce capacitance voltage:
Capacitance voltage and sampled signal are compared and produce comparison signal;
The conducting duration of ON time control signal with switching tube in the control switch circuit is provided; And
Produce control signal based on ON time control signal and comparison signal, with the switching tube in the control switch circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104018052A CN103475214A (en) | 2013-09-06 | 2013-09-06 | Switch converter and control circuit and control method thereof |
| US14/479,052 US9362824B2 (en) | 2013-09-06 | 2014-09-05 | Constant on-time control switching converter with DC calibration and control circuit and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104018052A CN103475214A (en) | 2013-09-06 | 2013-09-06 | Switch converter and control circuit and control method thereof |
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| CN103475214A true CN103475214A (en) | 2013-12-25 |
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| CN2013104018052A Pending CN103475214A (en) | 2013-09-06 | 2013-09-06 | Switch converter and control circuit and control method thereof |
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| US (1) | US9362824B2 (en) |
| CN (1) | CN103475214A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825433A (en) * | 2014-02-27 | 2014-05-28 | 成都芯源系统有限公司 | Switch converter and control circuit thereof |
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Also Published As
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| US20150069982A1 (en) | 2015-03-12 |
| US9362824B2 (en) | 2016-06-07 |
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